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  ____       ___      ______     ___      _  _   
 |  _ \\    / _ \\   /_____//   / _ \\   | \| || 
 | |_| ||  | / \ ||  `____ `   | / \ ||  |  ' || 
 | .  //   | \_/ ||  /___//    | \_/ ||  | .  || 
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 `-` --`    `---`    /_//       `---`    `-` -`  
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發送短信 : Symmetry Groups of Two-Way Twofold and Three-Way Threefold Fabrics